Kiyofumi Nitta et al 2009 J. Phys.: Conf. Ser. 190 012098 doi:10.1088/1742-6596/190/1/012098
Kiyofumi Nitta1, Yusuke Omori2, Takafumi Miyanaga2, Katsuhiko Takegahara2, Hitoshi Sugawara3, Daisuke Kikuchi4 and Hideyuki Sato4
Show affiliationsThe filled skutterudites RT4X12 (R: rare-earth, T: transition metal, X: pnictogen) show a variety of intriguing features by changing the combination of R, T, and X. Among them, some compounds shows characteristic feature called "rattling" that is considered as anharmonic oscillation or off-centered motion of rare-earth ions accommodated in the icosahedron cages made from pnictogen and "rattling" is suggested to contribute to the various features of this system. We applied extended X-ray absorption fine structure (EXAFS) on this system to clarify the microscopic mechanism of "rattling" motion [1]. Temperature dependence of EXAFS thermal (Debye-Waller) factors of R-Sb and T-Sb atomic pairs were analyzed by Einstein model. Thermal oscillation and static distortion are analyzed independently. From this study, we could know systematic information about "rattling" as a large amplitude oscillation of rare-earth ions and static distortion that has two types of cage space dependence.
61.05.cj X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.
Issue 1 (2009)
Kiyofumi Nitta et al 2009 J. Phys.: Conf. Ser. 190 012098
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